EP1171429B1 - Verfahren zur herstellung von melamin - Google Patents

Verfahren zur herstellung von melamin Download PDF

Info

Publication number
EP1171429B1
EP1171429B1 EP00908112A EP00908112A EP1171429B1 EP 1171429 B1 EP1171429 B1 EP 1171429B1 EP 00908112 A EP00908112 A EP 00908112A EP 00908112 A EP00908112 A EP 00908112A EP 1171429 B1 EP1171429 B1 EP 1171429B1
Authority
EP
European Patent Office
Prior art keywords
melamine
ammonia
gas
pressure
melt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00908112A
Other languages
English (en)
French (fr)
Other versions
EP1171429A1 (de
Inventor
Tjay Tjien Tjioe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke DSM NV
DSM IP Assets BV
Original Assignee
DSM NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DSM NV filed Critical DSM NV
Priority to EP00908112A priority Critical patent/EP1171429B1/de
Publication of EP1171429A1 publication Critical patent/EP1171429A1/de
Application granted granted Critical
Publication of EP1171429B1 publication Critical patent/EP1171429B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
    • C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
    • C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
    • C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
    • C07D251/40—Nitrogen atoms
    • C07D251/54—Three nitrogen atoms
    • C07D251/56—Preparation of melamine
    • C07D251/60—Preparation of melamine from urea or from carbon dioxide and ammonia

Definitions

  • the amount of ammonia in this case is 0.01-10 moles of ammonia per mole of melamine, and preferably 0.1-5 moles of ammonia per mole of melamine. Adding additional ammonia to the separator promotes the rapid separation of carbon dioxide from the reactor product, thus preventing the formation of oxygen-containing by-products.
  • the gas mixture removed from the gas/liquid separator may be passed to the scrubber unit in order to remove melamine vapor and preheat the urea melt.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Phenolic Resins Or Amino Resins (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Fertilizers (AREA)
  • Paper (AREA)

Claims (9)

  1. Verfahren zur Herstellung von Melamin aus Harnstoff mittels eines Hochdruckverfahrens, dadurch gekennzeichnet, daß hochreines Melamin aus der Melaminschmelze, die eine Temperatur zwischen dem Schmelzpunkt von Melamin und 450 °C aufweist, durch Einbringen eines ausreichenden Überschusses Ammoniak in die Melaminschmelze in einem Ammoniak-Injektionsgefäß unter Bildung eines Gas/Flüssig-Zweiphasengemisches, wobei das Gas/Flüssig-Gemisch ein Gas/Flüssig-Masseverhältnis von 0,01 bis 1,0 aufweist, und danach Sprühen des Gas/Flüssig-Gemisches mittels einer Sprühvorrichtung in ein Ausdehnungsgefäß, um das Melamin durch Ausdehnen und Verdampfen des eingebrachten Ammoniaks in dem Ausdehnungsgefäß mit reduziertem Druck abzukühlen und zu verfestigen, wobei das Ausdehnungsgefäß eine Ammoniakatmosphäre umfaßt, die über dem atmosphärischen Druck liegt, hergestellt werden kann.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Gas/Flüssig-Masseverhältnis zwischen 0,03 und 0,9 liegt.
  3. Verfahren nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß die Temperatur der in das Ausdehnungsgefäß zu sprühenden Melaminschmelze zwischen dem Schmelzpunkt von Melamin und einer Temperatur 45 °C über dem Schmelzpunkt von Melamin liegt.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Temperatur der in das Ausdehnungsgefäß zu sprühenden Melaminschmelze zwischen dem Schmelzpunkt von Melamin und einer Temperatur 30 °C über dem Schmelzpunkt von Melamin liegt.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Ausdehnungsgefäß einen zwischen 0,5 % und 60 % des Drucks des Ammoniak-Injektionsgefäßes gehaltenen Ammoniakdruck einschließt.
  6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Ausdehnungsgefäß einen zwischen 0,5 % und 30 % des Drucks des Ammoniak-Injektionsgefäßes gehaltenen Ammoniakdruck einschließt.
  7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Konfiguration des Ammoniak-Injektionsgefäßes einen Teil des Rohrleitungssystems zwischen dem Reaktor oder dem Gas/Flüssig-Separator und dem Ausdehnungsgefäß umfaßt.
  8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Ausflußgeschwindigkeit des Gas/Flüssiggemisches aus der Sprühvorrichtung größer als 50 m/s ist.
  9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Ammoniakdruck entspannt wird, wenn das Melaminpulver eine Temperatur von unter 200 °C aufweist.
EP00908112A 1999-03-08 2000-03-02 Verfahren zur herstellung von melamin Expired - Lifetime EP1171429B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00908112A EP1171429B1 (de) 1999-03-08 2000-03-02 Verfahren zur herstellung von melamin

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99200675A EP1035117A1 (de) 1999-03-08 1999-03-08 Verfahren zur Herstellung von Melamin aus Harnstoff
EP99200675 1999-03-08
PCT/NL2000/000129 WO2000053587A1 (en) 1999-03-08 2000-03-02 Method for preparing melamine
EP00908112A EP1171429B1 (de) 1999-03-08 2000-03-02 Verfahren zur herstellung von melamin

Publications (2)

Publication Number Publication Date
EP1171429A1 EP1171429A1 (de) 2002-01-16
EP1171429B1 true EP1171429B1 (de) 2003-02-26

Family

ID=8239957

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99200675A Withdrawn EP1035117A1 (de) 1999-03-08 1999-03-08 Verfahren zur Herstellung von Melamin aus Harnstoff
EP00908112A Expired - Lifetime EP1171429B1 (de) 1999-03-08 2000-03-02 Verfahren zur herstellung von melamin

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP99200675A Withdrawn EP1035117A1 (de) 1999-03-08 1999-03-08 Verfahren zur Herstellung von Melamin aus Harnstoff

Country Status (17)

Country Link
US (1) US6579980B2 (de)
EP (2) EP1035117A1 (de)
JP (1) JP2002539116A (de)
KR (1) KR100621290B1 (de)
CN (1) CN1148359C (de)
AT (1) ATE233248T1 (de)
AU (1) AU764140B2 (de)
CA (1) CA2366585C (de)
DE (1) DE60001495T2 (de)
EA (1) EA003141B1 (de)
ES (1) ES2193053T3 (de)
ID (1) ID29842A (de)
NO (1) NO319833B1 (de)
PL (1) PL201689B1 (de)
RO (1) RO121902B1 (de)
TW (1) TWI272268B (de)
WO (1) WO2000053587A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1022764C2 (nl) 2003-02-24 2004-08-26 Dsm Nv Natte quench.
DE502004003874D1 (de) * 2004-01-17 2007-07-05 Casale Chemicals Sa Verfahren zur schonenden Abkühlung und Kristallisation von Melamin aus einer Melaminschmelze oder aus der Gasphase
US7153962B1 (en) 2005-07-12 2006-12-26 Casale Chemicals S.A. Process for gently cooling and crystallizing melamine from a melamine melt or from the gaseous phase
US8563115B2 (en) 2008-08-12 2013-10-22 Xerox Corporation Protective coatings for solid inkjet applications
US8191992B2 (en) 2008-12-15 2012-06-05 Xerox Corporation Protective coatings for solid inkjet applications
US20170212484A1 (en) * 2016-01-22 2017-07-27 Hayward Industries, Inc. Systems and Methods for Providing Network Connectivity and Remote Monitoring, Optimization, and Control of Pool/Spa Equipment

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565867A (en) * 1984-01-05 1986-01-21 Melamine Chemicals, Inc. Anhydrous high-pressure melamine synthesis
FI96028C (fi) * 1993-07-01 1996-04-25 Kemira Oy Menetelmä melamiinin valmistamiseksi
AT402294B (de) * 1994-12-23 1997-03-25 Agrolinz Melamin Gmbh Verfahren zur herstellung von hochreinem melamin
GB9511357D0 (en) 1995-06-06 1995-08-02 Johnson Matthey Plc Improved antiviral compounds
US5514796A (en) * 1995-06-07 1996-05-07 Melamine Chemicals, Inc. Melamine of improved purity produced by high-pressure, non-catalytic process
AT403579B (de) * 1995-12-07 1998-03-25 Agrolinz Melamin Gmbh Verfahren zur herstellung von hochreinem melamin
NL1002669C2 (nl) * 1996-03-21 1997-09-23 Dsm Nv Werkwijze voor de bereiding van melamine.
NL1003105C2 (nl) * 1996-05-14 1997-11-18 Dsm Nv Werkwijze voor de bereiding van melamine.
NL1003328C2 (nl) * 1996-06-13 1997-12-17 Dsm Nv Werkwijze voor het bereiden van melamine.
ES2197470T3 (es) * 1997-05-21 2004-01-01 Dsm Ip Assets B.V. Metodo para preparar melamina.
KR100495264B1 (ko) * 1997-05-28 2005-06-14 코닌클리즈케 디에스엠 엔.브이. 멜라민의 제조방법
WO1998055466A1 (en) * 1997-06-02 1998-12-10 Dsm N.V. Method for preparing melamine

Also Published As

Publication number Publication date
KR100621290B1 (ko) 2006-09-13
CA2366585C (en) 2008-10-21
EA200100952A1 (ru) 2002-02-28
CN1349513A (zh) 2002-05-15
NO319833B1 (no) 2005-09-19
EP1171429A1 (de) 2002-01-16
EP1035117A1 (de) 2000-09-13
WO2000053587A1 (en) 2000-09-14
ATE233248T1 (de) 2003-03-15
US6579980B2 (en) 2003-06-17
DE60001495D1 (de) 2003-04-03
ID29842A (id) 2001-10-18
NO20014338L (no) 2001-10-30
EA003141B1 (ru) 2003-02-27
ES2193053T3 (es) 2003-11-01
AU764140B2 (en) 2003-08-14
JP2002539116A (ja) 2002-11-19
PL201689B1 (pl) 2009-04-30
NO20014338D0 (no) 2001-09-06
DE60001495T2 (de) 2003-12-18
RO121902B1 (ro) 2008-07-30
KR20010108327A (ko) 2001-12-07
AU2948400A (en) 2000-09-28
CA2366585A1 (en) 2000-09-14
CN1148359C (zh) 2004-05-05
US20020007061A1 (en) 2002-01-17
TWI272268B (en) 2007-02-01
PL351354A1 (en) 2003-04-07

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